If something has to be postmarked by March 30, does it mean that it has to be in the post office by that day?

Question

or does it mean that it has to be sent by that day, or what?

Answer 1

the post office has to date stamp it on the March 30 or earlier

Answer 2

It has to be post-marked by that day. If you put it in the post office after they are done processing mail, it will be too late.

I'm not sure, so you might call the post office to see if all mail deposited on a given day at a particular office will be cancelled after the office closes, or if they wait until the next day for some. They'll be able to tell you the specific policy.

Answer 3

has to be at the post office and stamped with the post mark.

Answer 4

any day before the 30th and no later than the 30th.